| 谭冉,沙云东.多物理场载荷作用下金属薄壁结构动力学响应特性计算与分析[J].装备环境工程,2024,21(9):79-86. TAN Ran,SHA Yundong.Calculation and Analysis of Dynamic Response Characteristics of Thin-walled Metal Structures under Multiple Physical Field Loads[J].Equipment Environmental Engineering,2024,21(9):79-86. |
| 多物理场载荷作用下金属薄壁结构动力学响应特性计算与分析 |
| Calculation and Analysis of Dynamic Response Characteristics of Thin-walled Metal Structures under Multiple Physical Field Loads |
| 投稿时间：2024-08-08 修订日期：2024-09-07 |
| DOI：10.7643/issn.1672-9242.2024.09.010 |
| 中文关键词: 薄壁结构 屈曲 模态 响应特性 疲劳寿命 雨流损伤中图分类号:V232 文献标志码:A 文章编号:1672-9242(2024)09-0079-08 |
| 英文关键词:thin-walled structures buckling modes response characteristics fatigue life rainflow damage |
| 基金项目:中国航发产学研合作项目(HFZL2018CXY017) |
|
|
|
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 研究航空发动机热端部件在多物理场载荷作用下的非线性动力学响应问题。方法 以多物理场载荷作用下矩形薄壁结构的试验和仿真验证计算方法为基础，分析计算不同温度工况下某薄壁结构的模态趋势，计算薄壁结构的屈曲温度。研究外部流场为150 m/s的工况下，不同温度载荷与不同声压级载荷共同作用下薄壁结构的响应。采用改进的雨流计数法及Morrow平均应力模型预估结构的疲劳寿命。结果 屈曲系数为0.5和1.1时，应力响应均在一阶基频激起最大峰值。屈曲系数为1.1时，薄壁结构较屈曲系数为0.5时损伤幅值增加。在声载荷声压级达到160 dB，屈曲系数为1.1时，雨流损伤矩阵循环块开始沿副对角线分布。结论 同一声压级下，随着温度的升高，结构疲劳寿命下降；同一温度下，随着声压级的不断提高，各屈曲系数的疲劳寿命均呈线性下降趋势。 |
| 英文摘要: |
| The work aims to investigate the nonlinear dynamic response problem of thermal components in aero-engines under multiple physical field loads. Based on the experimental and simulation verification calculation methods of rectangular thin-walled structures under multiple physical field loads, the modal trend of a thin-walled structure under different temperature conditions was analyzed and calculated and the buckling temperature of the thin-walled structure was calculated. The response of the thin-walled structure under the combined of different temperature loads and different sound pressure levels under an external flow field of 150 m/s was studied. The improved rainflow counting method and the Morrow average stress model were used to estimate the fatigue life of the structure. When the buckling coefficients were 0.5 and 1.1, the stress response was triggered to its maximum peak at the first fundamental frequency. When the buckling coefficient was 1.1, the damage amplitude of the thin-walled structure increased compared to that when the buckling coefficient was 0.5. As the sound pressure level reached 160 dB, the rainflow damage matrix cyclic block at the buckling coefficient of 1.1 began to distribute along the secondary diagonal. Under the same sound pressure level, as the temperature increases, the fatigue life of the structure decreases. At the same temperature, as the sound pressure level continues to increase, the fatigue life of each buckling coefficient shows a linear decreasing trend. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
